Year	Number
1996	18.0851058959961
1998	11.1702127456665
2000	14.8148145675659
2002	10.0529098510742
2003	10.5527639389038
2004	7.28155326843262
2005	8.25242710113525
2006	5.79710149765015
2007	5.31400966644287
2008	4.32692289352417
2009	6.16113758087158
2010	9.00473976135254
2011	11.3744077682495
2012	16.5876770019531
2013	15.6398105621338
2014	8.09523773193359
2015	15.7142858505249
2016	10.4761905670166
2017	9.5238094329834
2018	8.01886749267578
2019	10.3773584365845
2020	11.3207550048828
2021	10.3773584365845
2022	8.96226406097412